make a mold for custom in ear monitor

hii
I want to make a mold for custom in ear monitor, So I wanted to consult with you about the best material for making a mold.
It is important to me that after I finished and gave the mold to rest a few hours.I get a solid form be comfortable working with her, Be smooth and not too sticky. then i can pour into silicone or acrylic material.
And that eventually I can get the most accurate custom in ear monitor mold, So I can move to the next stage. i thought maybe the material:
OOMOO® Silicone Rubber

Audiologists make molds direct by injecting material into your ear and when the mold hardens it is sent to a specialist company. What I don't know is the name of the stuff. Try and find out from an audiologist dept. of your local hospital. Get friendly with a member of the staff . All you need to know is the name of it and where to buy it.